/**************************************************************************************************
 * @file        os_semaphore.h
 * @brief       信号量
 * @details
 *
 * @author      taoist.luo
 * @version     1.0.0
 * @date        2024-09
 *
 * Copyright (c) 2024 taoist.luo (https://gitee.com/harmonyluo(https://blog.csdn.net/harmonyluo))
 *
 * MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *************************************************************************************************/
#pragma once

#include <condition_variable>

#include "os_condition_variable.h"
#include "os_mutex.h"

class os_semaphore
{
private:
    mutable os_mutex m_mutex;
    os_condition_variable m_cv;
    int m_count;

public:
    explicit os_semaphore(int count = 0);

    // 获取信号量（P操作）
    void wait();

    // 带超时的获取信号量
    bool try_wait_for(const std::chrono::milliseconds& timeout);

    // 释放信号量（V操作）
    void signal();

    // 一次性释放多个信号量
    void signal(int n);

    // 获取当前信号量计数
    int get_count() const;
};